Mechanical connections



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Nov. 5', 1957 A, E. HARTMANN 2,812,198

' MECHANICAL CONNECTIONS Filed Nay 19. 1955 fa 21805235 lll? /J ATTORNEY United States Patent "a MECHANICAL CONNECTIONS Albert E. Hartmann, New York, N. Y.

Application May 19, 1955, Serial No. 509,531 4 claims. (c1. 287-1) This invention relates to a mechanical connection, and more particularly to a connection for releasably securing in substantially parallel relationship two 'elements or structures along adjoining `surfaces thereof.

The invention will be hereinafter described in connec-v tion with a combined shaving brush holder and cream dispenser, it being believed that the novel mechanicalconnection will find one of its -preferred'uses therein, but it is to be understood that the invention is in no way limited thereto, as many other uses and applications will occur to men skilled in the art.

The invention consists essentially of the combination of a pair of members each having a substantially flat surface along which surfaces the said members are to be releasably joined by the novel mechanical connection against axial or angular displacement. The first of the members is provided with a projection abovesaid surface thereof that is substantially of a height corresponding to the thickness of the second memberand somewhat off the point at which the-two members are to be connected. The point of connection of the first member is traversed by arivet or pin witha reduced neck portion and a larger head portion, both of said portions projecting above its surface of joint and the height of the reduced portion corresponds to the thickness of the second member to be attached to said first member.

The second member'is provided with a suitably shaped opening that consists of two communicating bores, the larger of the bores being of a contour to accommodate the projection of said first member and being sufficiently large to receive the head of the rivet or pin, and the second bore extending from the larger bore toward the point of connection of the second member and being of a width sufficient to receive and accommodate the neckl member, .the vlarger bore first surrounds the head of the` rivet and both members are then moved relative to cach other so that the neck portion of the rivet slides in the elongated reduced portion of the bore in the second member. During this movement, the second member is somewhat lifted so that the projection of the first member may enter the larger bore thereof, at which time the head of the rivet is above the points of connection of both members and the structure is locked against axial or angular displacement, whereby the two members may, for example, rotate in unison. To disconnect the two members, the second one is again lifted above the projection and vthe head of rivet ,slid in the elongated portion of the opening in a manner reverse to that described above.

In the accompanying drawing,

Fig. l is a longitudinal vertical section through a shaving brush provided with a cream dispenser in its handle portion, having a mechanical connection in accordance with this invention applied to its sealing and soap dispensing cap;

Fig. 2 is a plan view of the sealing cap illustrating the rivet head and the projection on its surface along which the connection is made;

Fig. 3 illustrates an intermediate disc or washer;

Fig. 4 is a perspective View showing the sealingrcap and the washer joined, and the reduced or neck portion of the rivet below the head;

Fig. 5 shows the first and the final step of joining a at composite spring with the sealing cap; and

Fig. 6 illustrates in section the sealing cap, the washer and the spring upon connection thereof.

Referring now first to Fig. 1, wherein the novel mechanical connection is applied in a shaving brushwith built-in cream dispenser, generally indicated by numeral 10, the dispenser consists of a hollow casing 11 provided with internal threads 11a, an intermediate member 12 having an externally threaded cylindrical flange 12a and an axially forwardly projecting extension 12b with a bore 12e therein. VThe rfront end ,of brush holder 10 is provided with a cylindricalmember 13 having an internally threaded portion 13aand a cylindrical portion 13b that receives and firmly holds the bristles 14.

The rear (in Fig. 1 the lower) end of the device is` provided with a sealing cap 15 that has an annular inner' groove 15a (better seen in Figs. 4, 5 and 6) and a flange 15b that fits over the reduced portion 11b of the casing, 11. The outer peripheral surface of cap 15 is preferably knurled, as indicated at 16. An externally threaded an-l nular ring 17 fits into the groove 15a and may be con nected to cap 15 by a pin 18.v

An axially inserted rivet 19 traverses cap 15 and securely holds thereto a washer 20 and the last leaf 21a of a.

composite spring 21 consisting of a pluralityl of round discs made of resilient steel or othery suitable metal, said discs being diametrically oppositely joined by point weld-".1 ing or soldering at their adjoining surfaces, as shown. ,The

front end leaf 2lb of the spring 21 is connected to a cream dispensing member 22 having an annular externally threaded flange 22a whose threads mesh with internal threads 11a on casing 11, said member 22 being axially traversed by a rivet 23, which rivet, together withprojection 24 securely holds member 2lb of spring 21 to said dispensing member 22 against axial or angular displacement. l

A similar brush dispenser has been described by me in U. S. Patent No. 2,568,856, granted on- February 7,

1950. The particular construction of spring 21 is of especial advantage in the devices of this character because the spring is adapted to transmit rotational movement from cap 15 to dispensing member 22 while being axially compressible at the same time to allow a capacity loading of shaving cream 25 into casing 11; Each leaf of spring 21 is provided with an axial opening 26 for easy insertion of rivet 23 into member 22.

Fig. 2 illustrates the at surface of cap 15 with the annular ring 17 removed from its groove 15a, showing a projection 27 and the head 19a of rivet 19. While the projection 27 is illustrated as being of semicircular contour, it may also be triangular, fully round, square or of any other shape.

Fig. 3 illustrates a washer 20 that is provided with holes 20a, 20h, to fit over the rivet 19 and projection 27, respectively. This Washer is placed onto cap 15 prior to the provision of rounded head 19a.

Fig. 4 shows the position of washer 20 on cap 15 with annular member 17 below and retained in recess 15a by said washer. It may be seen here that the head 19a of rivet 19 extends above washer 20 to form a neck portion 19b of a height corresponding to the thickness of leaf 21aA of spring 21, and that the projection 27 extends sufficiently above washer 20 to extend through leaf 21a, as seen in: Figs. 1, 5 and 6.

Fig. 5 shows in dotted lines the initial position of leaf geraten.

21a in the course of its connection to cap 15anditsna1. position in fulllines. Leaf 21a is provided with an opening 28 similar to a keyhole, ige. consisting of an enlarged 119,192.34 and anelnaatedaperturezltib terminatinggatith intendedpoint of connection of leafzlano;canili,` 'lhe width .Qi @nettare 2M carresnpndsstoithadiameter Qfnivet 19 belqw its Inni.` 1&1.;Y Aankomend-,dotted linbole 2,321 (is i first placed: over. the 7rivetthead; 19a. thealeaf t 21a then slid in a direction to guidegrivetpirrtion,lilla-into;V aperturelb, .wliilaleaftzlamf rcsiliennmetal-issomewhat raised out of' its toplerminprojectionlf] talenten, bbra. 2.8, the..nruietzto-1nis reeeivedi im the bore 28H, rivet portion 12a.. has Yreached,theextrema.and ofi abertura. 2.811,. and. tbetructurecis-secureln lokedaagainst .......aad-i1si1lardisglacementias shownimfull 11n -:sin.l Fin. Tg dierenriem. members ,2.1m and 151eai121af is; again.. bent. uawardlvit9 permitzproieetiom 21 to@ be: HwedltoathertwitbanilS .relative @saubere-28a; the.. above-deseribed; abscessian:of.` steps isfthen repeated, iarverseprder- Eigelb', Figi. 6.,i11iistrates..oinenlarsdL1 scale then-lower" endiotfbe deyie-.ltlsshowninlise1i totbetter stray/tibety rela@ epositioned.lbszltedtelemems 15. lgllfandizlasf, Connected bv n'vet 194andlgreventedromrelativerentibnbyfproiection?, except for members 17-rotatable with ,respectto ,cap15, in the,absenee .of,p'in;.18r..

ItA will `be seen,that, a novelconnection .by arriver llnivingg a head. t0, delinea neck; Portion therebe1ow,`.and;a projec tionin one member., securely retaining gasecond member having a suitableholewith a contour to receivegbothgthe. neckportion ofwthe rivetand the projectiom; hasbcen.

provided that insures permanent locking relationship .be

tween the .two connected members easy disconnection whendesiredband prevents the. two members lfrom relative. axial or angular displacement.

It4 willalSQ be understood. that simple modiications,: such as provision` of a square pin or rivet, or connection of asornewhat convenwith a ,somewhat concave. surfacemayy be made, within the scope, of.V this invention which.` may be especially` advantageously applied. tin, structures` whereiny a subsequent, riveting ,is` impossible onimpractical,

or ,where Vareleasable;connection without, observablepror, tuberanes.istobemadet.

1- .111.amechanicalmnneetiontforreleasablv oiineetins.

a pair of elements against axial and angular displacement,-4

tbtfombnttQnf a, first` element,,having1 a, substantially flat Surfasefaud projection extending thereabova a cou-1 necting member` anchored in ,said rstnelernent ...and pr.

testing?abeveadsurta thereof with.a,.headatits.free r endtdefnins a. neckrortion betweendsaidi surface-.and

Saidiheadind @Second .element otzexble. material. navaA ingarborerto. 4rteive.said.projection thereinand anelon.- gatedperture sormnuncatnawith. said .bore .antieimmft-WV istotthsrppint et connection of;saidaeeondlementto:,

Said. firstelement, ,.said. elongated. aperture and saidbore forming a keyhole in said second element, said neck portion of said connecting member being received in said elongated aperture and said projection being received in said bore, the thickness of said second element at the point of connection to said first element being less than the length of said neck portioniof said connecting member, and the width of said elongated aperture being substantially equalftothe transversedimensionof said neck portion of said.connectingmembenwhenisaid neck portion is received'in saidaperture.

2. The combination ofclaim 1; .whercinsaid neck portion of said connecting member is. round and said aperture is of a width substantially equalto the diameter of said neck portion.

3. In a mechanical connection for releasably connecting a pair of elements along substantially flat surfaces thereof, a firstselement having i aA substantiallyJ ilath surfaceeand a projection extending thereabove; a connectingfmember' anchored: inzsaid first' element and extending abovevsaid'i substantially dat surfacez thereof, andzalsecondelmcnt" havingifw substantially 'atfsurface corresponding `in contourztsaidzsurface of said rst lelement; said'second "eleu mentcb'eing inherentlyz exible and lliavingLa- -bore substan'd tiallwcorresponding fin contour to andadapted lto'rreceive" saiidiprojection; and "a .reduced elongatediaperturein-communicatinl with vsaidfiblore andV extending 'tofthe-r point 'off connection of said second elemenbto` said'lfi'rstelement;

'said i reduced'. elongated aperture and said"1 borel `forming a keyhole in Ysaidisecondelement; said 'connecting-member-L havingl` a; headfdeiiningsla` 'neck portion between ysaid -rstI element. and said/dread receivablefinf said aperture-iinfsaid secondtelement, whereby;l when saidy second felernent'is` tion towbringzfsaid projectioninto=said"bore; said neck portiom otf said connectingvmember-is v-received "i insaid'*' aperture.; to: join I. said: elements in"` parallel relationship;

borwhaving-.sa ibore'sfon reception# ofsaid1"='neck portibn-of-" saidtconnecting; membenvandtsansaperture:for receptionofe said:projectiorl:4

References Citedfintthewle of-tl1is.patent UNITEUUSTATES? PATENTS' 2,029,174 Ju'nge 4.Jall1..28,f.1936 2,110,137 Douglas .Mar. 8, `1938 2,319,782' Rourke May-25,V `1943 2.,'668g724J Gfodson' Feb; 9, 195.4l 

